note that unlike the original day pass you don't need a Half Fare card. But beware, when you start to buy it assumes you have one and you have to select "no discount" to change the price.
Other differences are that it is now quota based and prices WILL rise, only available from 30 days in advance and basically no changes after purchase. Not available to buy on day of travel even if the quota hasn't sold out.
The bottom line cheapest possible without Half Fare card in 2nd class is 52 Francs but this will sell out fast for popular days.